Optics - TIR

1

Avinav Prakash ·2010-03-09 05:57:08

this happens only wen the angle of the prism is 60Â°

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eureka123 ·2010-03-09 06:12:44

no

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Che ·2010-03-09 06:35:09

why not 60 ?

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eureka123 ·2010-03-09 06:43:53

ans is 36Â°

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106

Asish Mahapatra ·2010-03-09 20:13:35

Im also getting A=60Â°...

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Manmay kumar Mohanty ·2010-03-09 20:49:10

ME GETTING 60Â° TOO.

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eureka123 ·2010-03-09 21:04:03

but as i said ans is 36Â°

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Manmay kumar Mohanty ·2010-03-09 21:22:09

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UTTARA ·2010-03-09 23:17:40

@Manmay : I doubt

How can the angle I marked in red be 90Â° ????

It refracts then the angle ( which was normal incidence ) changes no ???

Plzzzz correct me if I'm wrong !!

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106

Asish Mahapatra ·2010-03-09 23:22:26

@uttara:
given in ques that ray is incident normally on AB

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UTTARA ·2010-03-09 23:31:54

Ya i've seen that but i meant i = 90

But is r = 90??

It may bend towards the normal no??

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Manmay kumar Mohanty ·2010-03-09 23:35:04

on incident perpendicular to the surface the incident ray goes undeviated.

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UTTARA ·2010-03-09 23:36:57

thanks Asish & Manmay

Then I guess Manmay's method is absolutely fine

@eureka : R U sure of the given ans (What's the source)???

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